Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb2459e5b1ce1d40…

MALICIOUS

PDF

72.7 KB Created: 2021-06-20 08:28:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b6b96a0f8d062d3bf2c9bd59243cdc1a SHA-1: fc6fce5c1c8c33943964e8445424e6f58a9b49e9 SHA-256: fb2459e5b1ce1d40e80266a4afc255448570b37cb2c17da670316db487ee8784
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent. These links likely serve as a lure to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b7efa743a---21021608550.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bd1cfd4681e---10877746233.pdf
    • http://alliance-vietnam.com/upload/files/53357718003.pdf
    • http://iehyun.com/editorupload/file/66590307031.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ruk5mh1mnk05gt3o8vrcutgncq/kuzosijogalunezijekilo.pdf
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/5e574065ec215ad4e53e140a8c17fa8e/66912250808.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/3664bb2d4543351420b64b4b88b41973/66022937923.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bdddfd5beff---bemabusagazo.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb63f74a5a---legibupizoxare.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/15210b6f26affe633336d7f42d607ffc/sovisulutupusunezeki.pdf
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/679adfa7a1546dd43a4ffb1dd7a2d257/2036569268.pdf
    • http://geredekombiservisi.com/userfiles/file/29900773456.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/2gjtq3l9m3ephn4th3grskdref/55247922030.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=mtg+commander+builder
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd74.bin
d6454c74ddab499e3e4ef8ffb6bb5d35c855af10e4799529aff684bcd2d1b3f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD74 5228 bytes
font_01_sfnt_off0000ef2f.bin
34deefcfe31bbf3d5756804eb1898b7914d8dcdf9dc3f9e566b6efb87830c9f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2F 11392 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.